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• Rails: Serializing objects in a database?

  - by keruilin

  I'm looking for some general guidance on serializing objects in a database. What are serialized objects? What are some best-practice scenarios for serializing objects in a DB? What attributes do you use when creating the column in the DB so you can use a serialized object? How to save a serialized object? And how to access the serialized object and its attributes? (Using hashes?)

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• How do I clone an OpenLDAP database

  - by elzapp

  I know this is more like a serverfault question than a stackoverflow question, but since serverfault isn't up yet, here I go: I'm supposed to move an application from one redhat server to another, and without very good knowledge of the internal workings of the application, how would I move the OpenLDAP database from the one machine to the other, with schemas and all. What files would I need to copy over? I believe the setup is pretty standard.

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• Multiple database with single application in php and codeigniter

  - by ASD

  I've developed a website in php codeigniter with the idea of using single physical instance of the code. Here the logic i wanted to be is on login page user will chose the companyid which will be internally to the database name. I want to know how to update the active_group variable according to the company id chosen by the user at the time of login. Is there any way to do so.

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• move data in bulk from oracle to SQL database

  - by Soja

  Hi All... Would like to know which is the best way to move data in bulk from oracle to SQL database programmatically in VB.NET application.This application is suppose to run continuously and moves data from Oracle to SQL whenever data comes. I have found OPENDATASOURCE but does not know the exact syntax. Can someone help me out. Thanks in advance,

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• how to querry on the database without accessing the tables, correct the database but not the tables

  - by user287745

  used is c# sql vs 08 sql server 2005 express whenever and where ever an sql select statement is used, its always like select * from tablename or count statement is alsi like select count something from table name for selecting or doing anything on the tables, i would like to know which tables exits in my the database i am connected to! so like select alltablenames from database_name. please guide.

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• XML Database in C#.net

  - by rookieinfotech

  I am developing a WPF client program for some websites. It uses XML database. I am new to XML. Would someone please explain how to create,append(Most important),edit,read&encrypt XML file. It is a big question,i know . But, it is urgent.Have to complete the work ASAP. Searched in the internet, not getting correct info.

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• Hibernate - Knowing when hitting database vs cache

  - by Marty Pitt

  Given all the smarts around Hibernate and it's various caching strategies, how do I know if a certain operation is resulting in a physical database hit, or coming from the cache?

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• Source control system for small database dev team

  - by bjorsig

  I am responsible for a small development team and we deal mainly with database development. We are currently using MS Visual Source Safe as our source control system, but it has its limitations and we are seriously thinking about changing. What system would you choose?

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• How to export a mysql database using DOS?

  - by samplera

  I have a database it is quite larger so I wanted to export it using DOS, but I dont know how to. Please help I am using WAMP

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• error while fetching empty column from database in iphone

  - by Jaimin

  i wnant to fetch the data fromt the database but getting error when i try to get the empty column... i used the following code to do it.. NSString *aDescription = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)]; so if my second column is empty than i get exception

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• Symfony (PHP framework) and MongoDB ( or any json-based database)

  - by fenderplayer

  I was wondering if its possible to use a json-based schema-free, document-based database like Mongodb or Couchdb on a symfony project like its used for ruby-on-rails websites? And if yes, how can it be done?

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• How to retrieve datas from access Database to Datagridview

  - by Shiny

  I have datas as unitprice with 10 decimal places in access database. I want those decimal places to reduce when it comes to datagridview(round to 2 places). How can i achieve this. Any idea. Thanks in advance

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• Are the ususal database performance-tuning tips invalide for a third-party app like Drupal

  - by Paul Strugger

  When you have a slow database app, the first suggestions that people make is to: Track the slow queries Add appropriate indexes In the case you are building your own application this is very logical, but when you use a CMS like Drupal, that are people have developed and tuned, is this approach valid? I mean, aren't Drupal tables already fine-tuned for performance? Even if I try to see which queries are the slow ones, what could I do about it? Re-write Drupal core?!?

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• Return more then One field from database SQLAlchemy

  - by David Neudorfer

  This line: used_emails = [row.email for row in db.execute(select([halo4.c.email], halo4.c.email!=''))] Returns: ['[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]'] I use this to find a match: if recipient in used_emails: If it finds a match I need to pull another field (halo4.c.code) from the database in the same row. Any suggestions on how to do this?

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• Select random line in SQL database

  - by Jensen

  Hi, I would like to select a random line in my database. I saw this solution on a website: SELECT column FROM table ORDER BY RAND() LIMIT 1 This SQL query run but someone said me that it was a non performant query. Is there another solution ? Thx

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• Select number of rows in all tables in the database

  - by Alex N.

  I wonder if this is possible with straight SQL on MySQL. I need to do SELECT COUNT(*) FROM on each table in the database and output results in one result set. Is it possible to do with just SQL?

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• What happens if MySQL database wasn't closed?

  - by mathew

  What happens if MySQL database is not closed? How do we know if it is closed properly?

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• mysql bug database error

  - by user963499

  Why is that when I search a row in my database, it ended up 0 results? In fact, there are rows that meet my search criterion when I view them manually, but the search button doesnt work as it is. Heres how you can see there are rows that have '0000-00-00 00:00:00' in them, but when I used the search feature, it ended up like this: take note that Im entering it in the right field which is 'AcctStopTime'. TIA

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• Linking database column to dropdown control in ASP.Net

  - by kunal

  I am using c# with asp.net and SQL Server 2005 as backend. I want to use dropdown list control in a form to populate a textbox. The dropdown control is linked to a column in the database. How can I code this in c#?

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• Manually Add a User to Database ASP.NET?

  - by user364878

  Hello, So when your using ASP.NET Wizards to create a login, it uses a set of auto generated tables using the aspnet_regsql.exe tool... When you create a user using the wizard it generates a very long userID "a40cf936-1596-4560-a26c-450792e2c8c0" I want to add users using another program that connects to this database... but how does visual studio auto-generate this ID. I want to auto-generate it as well Any ideas? Thanks in advance. -Scott

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• Finding simultaneous events in a database between times

  - by Tots

  I have a database that stores phone call records. Each phone call record has a start time and an end time. I want to find out what is the maximum amount of phone calls that are simultaneously happening in order to know if we have exceed the amount of available phone lines in our phone bank. How could I go about solving this problem?

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• How to take a backup of database of sql server 2005 in VB.net Using Code

  - by Darshan Dodiya

  Hi I want to know how to take a backup of database using programatically in VB.net of SQL Server 2005. if you are having and idea about it then pls send me the code for that.

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• CodeIgniter: Storing an image in the database?

  - by thedp

  Hello, I would like to store images in my mySQL database using the CodeIgniter PHP framework. How do I write and read the image? Thank you.

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• best way of oracle database partitions?

  - by murali

  hi, I have one table of 50k keywords and I am providing the auto-complete feature for these keywords based on count mechanism. But still getting the keywords takes time.. In what way would the database partitions have to be done for fast retrieving.... help me plz.....

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• ASP.NET MVC - Can't access a parent class in a database relationship (LINQ TO SQL)

  - by Alex

  I have a class User and a class History. History has 'User' property, and User has 'Histories' property. So there's a database relationship. But when I create a new User history class and set UserID property, I can't access the 'User' property. var history = new History { UserID = 1 }; // history.User = null ??? How can I get the user?

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